Roll external/re2/ b673de358..ece4cecab (2 commits) (#5437)

https://github.com/google/re2/compare/b673de35837a...ece4cecab5c8

$ git log b673de358..ece4cecab --date=short --no-merges --format='%ad %ae %s'
2023-10-10 junyer Enable parse headers features. Enforcing that headers are self-contained.
2023-10-10 junyer Enable layering check features. Useful on Clang only.

Created with:
  roll-dep external/re2

Co-authored-by: GitHub Actions[bot] <>
diff --git a/DEPS b/DEPS
index 3d6f331..6e3c67e 100644
--- a/DEPS
+++ b/DEPS
@@ -12,7 +12,7 @@
   # Use protobufs before they gained the dependency on abseil
   'protobuf_revision': 'v21.12',
 
-  're2_revision': 'b673de35837aad63146957b9c305dbdbd82ce6b7',
+  're2_revision': 'ece4cecab5c8445d93abd98d88c899f370b4ea4a',
   'spirv_headers_revision': 'e867c06631767a2d96424cbec530f9ee5e78180f',
 }